26．______life began on the earth is one of the biggest puzzles to scientists.A．H

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26．______life began on the earth is one of the biggest puzzles to scientists.

A．How

B．What

C．Where

D．That

答案

解析

略

举一反三

30．QQ,______you can chat with your friends, makes communication easy.

A．why

B．which

C．that

D．Where

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35．---Are my clothes too casual?
---No. You can go__________you are.

A．as

B．what

C．that

D．Where

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22.Some people are worrying about the possibility ________ cellphones could be responsible for a range of illnesses, from rashes to brain tumors.

A．that

B．why

C．how

D．Whether

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31. Stronger and more lasting memories are likely to be formed ________a person is relaxed.

A．where

B．unless

C．when

D．Although

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35. Everyone has periods in their lives ______ everything seems very hard.

A．when

B．where

C．which

D．That

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